🦠Bacterial diseasesModerate
Bacterial Speck
Risk near you, next 48h
See whether your local forecast favours this disease right now.
When it strikes
Temperature
13–25°C
Humidity
≥80%
Leaf wetness
Required
Season
Spring
About
Bacterial speck (Pseudomonas syringae pv. tomato) is a cool, wet-weather tomato disease that blemishes fruit and spots foliage, most damaging early in the season and in spring transplants.
Symptoms
Tiny dark brown to black specks with narrow yellow halos on leaves, stems and especially fruit, where they stay small and superficial but downgrade quality.
Organic Treatment
Remove infected debris, avoid overhead watering, and apply copper preventively in cool wet spells. Use clean seed.
Chemical Treatment
Copper plus mancozeb on a preventive schedule during cool wet weather.
Prevention
Use certified seed and transplants, rotate, mulch, water at the base, and avoid handling wet plants.